Holding device



J. DRAZICK HOLDING DEVICE Jan. 24, 1961 2 Sheets-Sheet 1 Filed March 9, 19 59 E INVENTOR.

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J. DRAZICK HOLDING DEVICE Jan. 24, 1961 2 Sheets-Sheet 2 Filed March 9, 1959 IN VEN TOR.

ua/M/ DPAZ/C'K .47'rok/virs United States Patent HOLDING DEVICE John Drazick, 8565 Steel Ave., Detroit, Mich.

Filed Mar. 9, 1959, Ser. No. 798,158

Claims. (Cl. 279-76) This invention relates to a toolholder and has particularly to do with toolholders utilizing a spring pressed detent to retain a tool in its socket.

These are used extensively for holding dies and punches in a die bed. It is important in these constructions that it be easy to release these dies for replacement or for changing a particular set up.

In the past it has been common to utilize hardened die plates for the purpose of retaining the detents wh ch are made of hardened parts.

It is an object of the present invention to provide a die holder construction which can utilize a soft die plate, that is, one that has not been heat treated. It is a further object to provide a construction wherein all of the drilling in a die plate can be accomplished from the top of the plate making it possible to insert new holes in various positions if it is desired to change a set up.

It is a further object to provide a unique actuating device for a die holding detent which can be entirely inserted from the top of a unit with standard tools.

It is a further object to provide a detent having a nose portion which can imbed deeper into a tool shank than is possible with a hardened ball which must be retained by the area around its diameter. It will be understood that this holding mechanism may be used for numerous purposes where cylindrical shafts are to be releasably inserted into a body.

Other objects and features of the invention relating to details of construction and operation will be evident in the following description and claims.

Drawings accompany the disclosure and the various views thereof may be briefly described as:

Figure 1, a vertical section showing the relationship of the parts in holding position.

Figure 2, a similar section to Figure 1 showing the holding detent released.

Figure 3, a top view at arrow 3 of Figure 1.

Figure 4, a sectional view on line 44 of Figure 1.

Figure 5, a sectional view of a modified device showing the manner in which it may be used with blind holes in a holding plate.

Figure 6, an elevation view of the locking plunger showing the notch in the outer wall.

Figure 7, an elevation of the recess opening in the tool shank of Figures 1 and 2.

Figure 8, a perspective view of the plunger shown in Figures 1 and 2.

Figure 9, a modified locking recess in a tool shank.

Figure 10, a sectional view on line Iii-10 of Figure 9.

Figure 11, a perspective view of a modified plunger to be used in conjunction with the recess shown in Figure 9.

Referring to the drawings, the die bed is composed of a bottom plate 10 and a top holding plate 12, havin a hole 14 to receive a shank 16 of a punch 18. The punch has a recess 20 in one side of its cylindrical surface, this recess being constructed to receive a detent 22 mounted in a hole 24 at the side wall of hole 14. It

will be noted that the angle of hole 24 is such that it can be drilled from the top opening of the hole 14 and it can be a blind hole as evidenced by the base 26 shaped to form a seat for a spring 28 having its other end seated in the recess 30 in the inner end of the detent 22. The nose of the detent 22 is shaped to have a close contact at 32 with the recess 20. i

The detent is actuated by a hardened pin 40 actuating in a slot 42 cut into the edge of the detent, this slot having a side wall 44 and a bottom wall 46. The pin has a head portion 48 which moves up and down in plunger-like fashion in a recess 50 of a holder insert 52 which is threaded on the outside to be received ina threaded hole 54. The top of the insert 52 is provided with a hexagonal hole 56 as shown in Figure 3 to facilitate the introduction of the insert into the opening 54. This hole 56 also permits the entrance of an actuating punch 60 which can apply pressure to the head 48 to move the pin downwardly.

When the pin 60 is inserted in the hole 56 and pressure applied to the head 48, the bottom end of the pin 40 cams on the surface 46 as it moves the detent 22 downwardly into the hole 24 against the action of the spring 28. This releases the shank 16 for removal. When the shank is replaced, the detent can be released to lock against the shank. The spring 28 as well as the wall 44 limit the downward motion of the detent and the outward motion is also limited by the contact of the pin head 48 with the top of the threaded insert 52. Clearance is provided between the head 48 of the pin and the top of the insert 52 when the tool is in position, thus insuring contact of the plunger 22 with the recess 20.

Referring further to the drawings, in Figure 5 a modified construction is shown in which a bed plate or holding plate has a blind hole 82 to receive a shank 84 of a tool. This blind hole has a threaded portion 86 at the bottom in which is received a hardened insert 88, the insert being threaded on its outer surface and having a top recess 90 for an Allen wrench. A plunger 92 is received in a recess 94 of the tool shank, the plunger acting in a bore 96 which is also a blind hole in the block 80. The plunger is backed by a spring 98 and provided with a recess 100 which receives the' actuate pin 102, acting in the insert 104.

In both Figures 1 and 5 the insert has a cylindrical surface which engages with a similar cylindrical surface in the recess 20 of shank 16 in Figure l and recess 94 in the shank 84 of Figure 5. In elevation this recess is more or less egg-shaped as shown in Figure 7. 1

In Figure 8 a plunger 22 of Figure 1 is shown in perspective. In Figures 9 to 11 a modified shape is shown for the recess in the tool shank. In Figure 9a shank has a recess 112, the sides of Which'are straight walls with an enlarged depth toward the center and decreasing toward the other end. A section is shown of the slot in Figure 10. The plunger, which cooperates with this slot, is shown at 114 in Figure 11 having a nose portion 116 which engages the walls of the slot 112 at the area of 118. The operation of the plungers in each embodiment is identical in the retraction features.

I claim:

1. A releasable holding device for retaining cylindrical shafts in cylindrical sockets of the type in which a releasable, resiliently-biased plunger engages a recess in the shaft, and in which the plunger is inserted into an angled bore intersecting the cylindrical socket, that improvement which comprises a plunger with a triangularly shaped notch in one side thereof, a pin disposed parallel to the socket spaced therefrom intersecting said angled bore having one end bearing against one side of said notch, means retaining said pin in said body, said means being apertured'to permit theintroduction of an actuating probe for shifting the plunger by pressure ,on the pin.

2. In a holding device wherein a cylindrical shaft is retained in a cylindrical socket by a spring pressed detent adjacent the socket in .an angled bore intersecting the :socket, that improvement which comprises means movably disposed adjacent said socket having a portion enaging said detent, and means to retain said last means adjacent said socketshaped to permit the access-of an actuating tool wherein said first means may be actuated to shift said detent out of the socket to permit insertion and removal of a shaft.

,3. In a holding device wherein a cylindrical shaft is retained in a cylindrical socket of a body by a spring pressed detent adjacent the socket in an angled bore intersecting said socket, that improvement-which comprises a detent member having a recess in 'the outward :side thereof, said recess having a surface extending substantially transversely to the socket, an actuator and retainer for said detent member extending into said body having a portion to contact said surface, means-to guide and limit the motion of said actuator and retainer to block the movement of said detent member in the direction of the socket, said actuator and retainer being movable in .said body against said surface to cause shifting of said detent away from said socket to a released position.

4. A device as defined in claim 3 in which the recess ,in-said detent member is a triangularvnotch with base surface substantially transverse to the vsocket, and in which the actuator and retainer for the detent is a headed pin having its end in contact with the base of said notch, .saidpin being slidable in the body in a direction parallel pressed detent adjacent the socketin an angled .bore intersecting the socket, that improvement which comprises a .detent having a nose portion for contacting the surfaces of a recess in a shaft and having the other endrecessed toserve as a spring seat, said detent being slidable in an angled bore positioned and dimensioned to be drilled from the opening of the socket, the bottom end of said bore serving as aspring seat.for the other end of a spring engaging said detent, said detent having a notched recess in one wall thereof, said recess being triangular in shape having a base surface substantially transverse of the socket, a pin mounted in said bodysli'da'ble in a direction parallel to the socket 'havingits inner end slidable in the recess of said detentand contacting said base surface, a head on said pin movable in an enlarged recess in said body above said pin and a guide and retaining means in .pin, the outer end of said insert being apertured to facilitate the insertion of said insert and the insertion 4 also of an actuated tool for moving said pin and said detent to .areleased position.

7. In a holding device wherein a cylindrical shaft is retained in a cylindrical socket by a spring pressed detent adjacent the socket in an angled bore intersecting the socket, that improvement which comprises a blind hole in a retaining block, means in the bottom of said hole formed of a hardened material to provide a hard base for a tool in a socket, means movably disposed adjacent said socket in a direction parallel thereto, having a portion engaging said detent and retainer means for said last means adjacent said socket shaped to permit the access of an actuator tool wherein said first means may be actuated in a direction substantially that of the socket to shift said detent out of said socket.

8. In a holding device wherein a cylindrical shaft is retained in a cylindrical socket by a spring pressed detent adjacent the socket in an angled bore intersecting the socket, that improvement which comprises means movably disposed adjacent said socket having a portion engaging said detent, said means being shiftable to disengage said detent from a tool in said socket, and a toolshank in said socket having a recess with cylindrical surfaces aligned with said angled bore wherein cylindrical surfaces on a detent may engage said recess walls to lock the same in position.

9. In a holding device wherein a cylindrical shaft .is retained in a cylindrical socket by a spring pressed detent adjacent the socket in an angledbore intersecting the socket, that improvement which comprises means.movably disposed adjacent said socket having a portion engagingsaid detent, said means being shiftable todisengage said detent from a tool in said socket, and a tool shank in said socket having a :side wall recess provided with straight walls converging downwardly to a joining line and a detent in saidangled bore having similarly converging straight walls for engaging the .complemental walls of the tool shank.

10. In a holding device wherein acylindrical shaft is retained in a cylindrical socket by a spring pressed detent adjacent the socket in an angled bore intersecting the .socket, that improvement which comprises a threaded References Cited in the file of this patent UNITED STATES PATENTS 1,860,998 Drazick May 31, 1932 1,910,275 Alden May 23, 1933 1,974,217 Richard Sept. 18, 1934 2,580,930 Kost Jamil, 1952 

